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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb49513ad07de6589f9836c39dd0b9935339867bc7576143a5d10fa9d0891da9' 
  AND token = 'E1b+PRxS9BjLUEaZkxXicqo3ry2Ma//DBKGMKUxQSqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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