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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f054725fd76412b5ba8b5033492f1b42dbd5936646680c3ff95faadbecec5aa' 
  AND token = 'ZV4MZA+J3blK9oFM4JYZ4U7LTbtWoCtpCde8byiPSbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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