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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ab76244598f22ebc7e63926c6637296d88886d1bd0c19fd776d6bf635b6db52' 
  AND token = 'FPNPYME3/sNy/MyQaZDEsQM1WPDgYxLAxia8fT7SHwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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