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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c5a11efffb65fcf03fbd6ab3442fbdddcbd092be9abc2e7b404c28148bd565' 
  AND token = 'jqJM7+BmcO20ZvIXyX675ff+eiwnb4TB5SSgE/VDvtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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