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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1b32938ad13467a347a16f78e24c5382ce1e7bfde56dd26c42ab58016d5172' 
  AND token = '0DC/mXM7eOf3Fe3OuLdrHWKCKefnJR2RRsb9xyuJdDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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