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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '997417072ce0217a9e78e3b12774db890504615c88f8b8568f660320640b2484' 
  AND token = 'N+nw4rVl/tgFytZrGBH4ArcUFj0sgj4hfl1E5RkdHF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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