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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '332fc61ce255c6afb29e077dc0975e93e4767cc12b83ed02bd6b7116589c267c' 
  AND token = 'IecLKItZlOeau80cFipyFme6f9fbesDMDZYXcghkHWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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