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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe71bc4418acdb2e61dbeac5c0ab1b2756d97ba82f94963c1e596bcbfdd211f5' 
  AND token = 'iGoTB06IHl5NsneGVH4ex9FwrUAmtNfMi3mN/4wyIA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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