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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e4df50c77f122b63753e9ba8866855b8d9df9ce82aead8521fe90c568aeeb06' 
  AND token = '5YgLulgthsNs/TgIu4h/LsN8jnrECf3z7ibPXgZ2008=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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