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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc706e715925fd0712b0c212d25d64f84405746b42e8c075a614e6b535139e48' 
  AND token = 'IP9GjxytpPEljidGs+sUJ8zDD4n9+dsDpMCcpafZdb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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