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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '295821ecb7d48c994770ef5b840ff9e4042c39d6177ec2345d8343ab2b27fa9b' 
  AND token = '9ufVBkg9SJBoWLW3dols2t0304EwayZNIpjGBvK9Ab0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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