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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d1a48ddef262c11ad96d7afa5301be70e013b629b88845327627aec0b2d30c0' 
  AND token = '97oBQFIoV9S7T3tRK/usDIXd+tzPDSVpZIAWnN8eQHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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