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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4364055409f588552ff1136cca7bfaecf2fdc86a137a946d4dfbc1fd0ea84ec5' 
  AND token = 'fQFS2GdgbR76fZN88clGkxrxA9VPd6XjeSwNwAszUPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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