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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52b3eb4c15a506a4c96f02fc35662b389208517a654a0b246ddcc92e0527ed02' 
  AND token = 'S93jY4LrekZb8LhPP/hLjF6/fshp/PkS9QhSn7gztBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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