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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb895bc035810b6d45ca43387e61f2b0a5fa46da86413626205e57b232be179b' 
  AND token = 'HSIU608jPA1rrS7nbG2sSDKnreXhhtVPrNfs6l7cGgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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