SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf17afcbf1bd9e7f43ca00f0ba93522c1effd3f477d691b7ddff6e7825fe9a2c' 
  AND token = 'm0sQY6DgvI/QLApZR4cWYjOjXNIeiYq+JLkPR9NUlr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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