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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96034a12a52361957113e5e19e839704ff22f36fb4f0613ce5e619cf8c9a6015' 
  AND token = 'L5oo+uHGp5GXpWzk+aiaJhGAEulbssaeD7XFZmeDTlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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