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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc28483324508da7f55043624641c8e30c53ade7c3eec552a93ea8229d348f6c' 
  AND token = 'ZtIXb/8diD11SGnw1xHaNMdh0KcaEDxeGUCMw4BgaFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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