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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfa3a11b691a21cd49476bdee0d0c27677babea1b7bbd6800a345dafc0105cfe' 
  AND token = 'tlE16qbeQkDKYZwcZafUtIyiHZW91gdwwpCJFbkg+fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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