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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '183bede9a387512407ed957e18365e028736da6630aaad08af3f289ac24294f4' 
  AND token = 'uS8CcsqektW6HNLiYIvSvRhQEiX8/t69MX4oxfwqJWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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