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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8995c84e71d55dd99ba29949d33d86e94e2386176d21055d08565042f696bdf8' 
  AND token = 'I8dPhdQMioltFdZwWX49mMeOIoSCS0avwV+28A8/h2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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