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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd841b21f58bbd2dccdd833eab6a90582caed6794057f27a49fc94aed4c9053b' 
  AND token = 'N+Y7CeoO3e+9cGlW88DwKxp4IZh+WcYDwS5wvEh0z+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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