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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f10b9f43c5d00019d892a3b9021a86e7ee407a8a42eda3d7975aff40c72c55d1' 
  AND token = 'F+SZGdhMxirzn6P21WZsItY8VE7vmAEYnTdA9iQ1yns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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