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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a8e6b7f69e71073bc25c6068e7935ac65f2aa44b9a0278dc5d7e351bac9078' 
  AND token = 'cvZ5yr3gqm+JF+6Q8neY1Uk8OrqsQHiHSOCfEpL1AHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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