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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7468b6f69fed12e82d2685f82999f236ec6fa4469a9547f1c76fe99f5312ca83' 
  AND token = 'nuTxXyIxkHGcubw4WSRekj9ckwxP0V8sg40giCcrACo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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