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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61b1e723f0f662897ae1c49c94e5a787b2b7096eb184cc2e09ceeaafc69a5dbb' 
  AND token = 'rcLIFwCjXbucxH/jpnpPfMIL48/BURV2zm84pjm5aCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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