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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bcbcae1773aa03cc822e29afe72402411d1636bb9222f998ba5a31d50a43e47' 
  AND token = '0204qvmMT5PYJKnLXqZ+3SbK1To2dVuN9XKrkO+x2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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