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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dffd854324d48dffb19c91cb6ff192d5e0e92de572cb0f91e2fdfd4c909b9b9d' 
  AND token = 'vJtcCfHtcBwKb2IeO2v2xGQshBnsP5kZW2YN8o0lMk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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