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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbce2efb2637659f4c0f159e5968c7d868b733a8d55a14196be3cb99c5b917c0' 
  AND token = 'stoL20hOf2F35gNWtZkUbnmMX15aJb64H/W+mkiTObM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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