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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccf3346e5349f441ebddce85b5256448410d55e0c74e655560e94e128d324230' 
  AND token = 'Zrz1WQSGpbxX5K7DAh1j/lITMiYge98vNjlEL23ME3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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