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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32dc91ac361d965765b475ff038f73ef6763b3ae77a3866c177b26b0941c3a10' 
  AND token = 'XDRpVE8MHMDuruZH7Lf9Dab/pFavReP8X+ZKZE0+/zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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