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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '662ca502e1213266959bfe38e172700300b794f6c6a7d48534f33323e2d67f88' 
  AND token = 'WCLzmV88U5NNyzrNEh/Q80f4AfOZ6g6QAUQfxO9dU74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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