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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b2427fdd8ae3106eaf96b9f2b8b1cd095807a6ead2e626c26daf52fd6a9fe6e' 
  AND token = 'La6xfGJzazyxvcVdpbaY49xF9i17pOT7aHF1EjZeaH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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