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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99b5b4cbec8dfcac205b05c8964938fa45bace0bbc0ecc3f18c9914a7b0e8e18' 
  AND token = 'e8FtgbLyd88c475SM2rYxpAQsuHrD7Jan4pKKOOj2yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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