SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ad9e92625c119f59dd9989803c23f8a036aedf818712cbf360fb7b19b32b106' 
  AND token = 'J8XU+n3S1YzvvOqj+JLUOV3rRA6X4+78ZNEzdXuhfR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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