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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bddeb770d13f94efb59cb93b582982e1a3222b2cdd6455de520f75270113de7c' 
  AND token = 'GJLWWa806knJyJbOfCCbm6FDIztstA/fkqpwhd23S0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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