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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '090cab1166d8a72f9c4b72949f738d7004602a652901e801c9025886e90dc5d0' 
  AND token = 'zje89/AAmR4rbMIcUhWqbhctfFIcWxG2NXN3vJ9okVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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