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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c70a0eb525cd839f03e46b613a6570cd1dd4971d66343eba08771e42344fa39' 
  AND token = 'MgIkB06cCjxUQrDYrufMB4SDyps77rbHaIsHWA73dk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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