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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1c6f1d166e154a38502b9277f2c96b3bb30cda13dc4a10f22faee51b65b531d' 
  AND token = 'GwmScATUSpvrW4rJ9MJ/kPI8GmrDtxZCY3dZX5VECEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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