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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0481feefd66bc43511c27b90cc0f0991fbb0f7df1c0c16efdee2db95ef91817' 
  AND token = 'OIwJRLuRMJuiZgSTwOd3iv2kh9PQEN+vMhMU43vUMLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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