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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75dc5875e795c25ca9143b604db195b8a856af83e9c3d71d056b86539f9a4bbd' 
  AND token = 'R42CZ3XUgBHjrmjSu0PGe0RuI9k8a5Dkkl7AkVJ4Eno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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