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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '470ada0903126316fcd8afa254864b436added4f1f38f5e2ebe2f54d083ae91c' 
  AND token = 'I3RaPRuju+aQww1AI+NW7yauevujPKf2mQ/PsOix+mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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