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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa10c10c7970080b8f87c990f7cb5df50350249b3d03090538c2dc9dcb8f0cd9' 
  AND token = 'KFDdkkKZs+T+Qbaf7Sf1CrzPvzt0dhGC5cZBJMGHAmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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