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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3b498cb6cbfde8e3a897835073597ac522a20a4ebd7805737d0191220fe3d6' 
  AND token = '66WFEMGOv9Mv8kDnwYMK5HifMbBc1g5GPqQJPWoMFE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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