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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b2be561feff9907aeb1e25113359f61212b7889fc4754e20edab268a36eb806' 
  AND token = 'Sc6QSbiPRgpi3AbhCeE+okBrJkfOG75b/gQ1suUDRL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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