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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49ae7fa562f1161a0b9967b2f92bc299f8684a1666a4070b428f5984137a72fe' 
  AND token = 'C03t0yDka8a8LXvqc60U7dPCC2gbkmurLPblCXPhysU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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