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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd60b2d679e002ff9d2cb9f5172bb21fa1295f31b476d3adfcc04974628e2bb' 
  AND token = 'K0TNYRqYS+2kQMbCFaVjbghkDdVyfCC+O9+1H67o4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}