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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1df2194950301f661754d89c8691f64e7f85b7aa49f432d7acc2dd856e0d2bff' 
  AND token = 'jL8vGfdaJf5A99QpFLFpvgRT2+0Cx5FC5bZoSf/0hd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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