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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfd4e4a8d63b8a6dd37a4412e1fbc442d2d010c9cdf5e6a7e620f7790d305e9b' 
  AND token = 'hj/5P077M2lwiQns4+0Qs+clg6EEi7vHKk9CZxMVMPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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