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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edc8a47733c1bc7ce96d55dad3d43c10b3ef18ad8076c08229a030a192c3b9e2' 
  AND token = 'hUpDDVsiVQDXmPoOZGbMco8+syL7JRW+G6d+z9gx7MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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