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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a110dadc7b5c16a70574bbd40c732cb7b40822f7a284115995e45c1d2aa4f60a' 
  AND token = 'KJQjy0GbUQwOKphqkuib7VtWzMFQoz1m9ySdtV0V450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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