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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4855cceb0629e99cbfc882776216dc958e62c45b5e8ae6844045655550ad91' 
  AND token = 'wROZFmNrQ7fNfYI/v32RtNqHXmp/bFV1oDSnDDpSy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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