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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d1d738a61ec267352d9b954f619679d2d94b96f6ebd9ca39b0033a0cc12009' 
  AND token = 'ENv644pzit7K9PjcxjTr3JIIcU8CpcM/h/Omh/wkhik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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