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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a86b4974bc75e93d01ce1f31eacd656fced6ab76244740915fa3514ab56a5034' 
  AND token = 'j8QDhnv55TfvGmf6JAcixrxmC0bIaHzub6ybZ8aIz3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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